Thanks Gabriel.
Shrevis, several club members have the Tunze Wavebox and love it. It definitely is fun to see how the corals ebb and flow in water. The Tunze forum here on RC used to have videos you could watch of it in action, but any number of people here probably could post videos if you ask for some.
The box is rather large and bulky, and there is the fact that the lifespan of the tank is weakened by 20% due to the back and forth action stressing the seams. That would be one for the "cons" list.
I've thought about putting one in my tank a number of times, but money and desire never aligned.
A closed loop or the use of Tunzes or VorTechs will keep your system's flow going nicely.